Been told by my freindly mechanic that after a diagnosis my Focus 1.6 Setec (52 Plate) that the above sensors need replacing. Has told me hat the Cma Shaft sensor is around £50, but doesnt yet know the cost of the Lamda Sensor.

How much do one of these cost??

 

About £121 from ford

You can get cheap 'universal' ones for about £15, but they don't last 5 minutes.

 

I would get a second opinion before you spend any cash. What symptons do you have? What mods have you done?